msm: adsprpc: register wake-source clients during driver init

Currently, wake-source clients are being created during every new
process init with the same device and client name, which is
unnecessary and redundant. Instead, register the secure and
non-secure wake-source clients during driver init and use the same
clients for all processes.

Change-Id: I685fafae74d18e1004c6adbfada436a33a727bef
Acked-by: Thyagarajan Venkatanarayanan <venkatan@qti.qualcomm.com>
Signed-off-by: Himateja Reddy <hmreddy@codeaurora.org>